On his twenty-fifth birthday, Diesel Lagerford is visited by a twenty-six-year-old version of himself. His look-alike spins impossible tales of their shared future, claiming they have dozens of brothers from parallel timelines who can visit each other using a T-box, a machine they bankroll with lottery winnings. He introduces Diesel to the incredible Lilah Spencer, the T-box operator, and Diesel falls head-over-heels in love. But during his travels across timelines, Diesel learns that Lilah will soon die under suspicious circumstances. Devastated, he joins his brothers in a race to save her. Can they solve the mystery of her death before it’s too late? And will their unusual solution play out over time in the ways they had anticipated?